Rockwell Automation 20A PowerFlex 70EC/700VC - Manual (Page 19)

Auto Restart 15
Auto Restart The Auto Restart feature provides the ability for the drive to automatically perform
a fault reset followed by a start attempt without user or application intervention.
This allows remote or “unattended” operation. Only certain faults are allowed to be
reset. Certain faults (Type 2) that indicate possible drive component malfunction
are not resettable.
Caution should be used when enabling this feature, since the drive will attempt to
issue its own start command based on user selected programming.
Configuration
Setting [Auto Rstrt Tries] to a value greater than zero will enable the Auto Restart
feature. Setting the number of tries equal to zero will disable the feature.
The [Auto Rstrt Delay] parameter sets the time, in seconds, between each reset/run
attempt.
The auto reset/run feature supports the following status information:
Parameter 210 [Drive Status 2], bit 8 - “Auto Rst Ctdn”
Provides indication that an Auto Restart attempt is presently timing out and the
drive will start at the end of the timing event.
Parameter 210 [Drive Status 2], bit 9 - “Auto Rst Act”
Indicates that the drive has been programmed for the Auto Restart function.
The typical steps performed in an Auto Reset/Run cycle are as follows:
1. The drive is running and an auto resettable fault occurs, tripping the drive.
2. After the number of seconds in [Auto Rstrt Delay], the drive will automatically
perform an internal Fault Reset, resetting the faulted condition.
3. The drive will then issue an internal Start command to start the drive.
4. If another auto resettable fault occurs the cycle will repeat itself up to the
number of attempts set in [Auto Rstrt Tries].
5. If the drive faults repeatedly for more than the number of attempts set in [Auto
Rstrt Tries] with less than five minutes between each fault, the auto reset/run is
considered unsuccessful and the drive remains in the faulted state.
6. Aborting an Auto Reset/Run Cycle (see Aborting an Auto-Reset/Run Cycle for
details).
7. If the drive remains running for five minutes or more since the last reset/run
without a fault, or is otherwise stopped or reset, the auto reset/run is considered
successful. The entire process is reset to the beginning and will repeat on the
next fault.
Beginning an Auto-Reset/Run Cycle
The following conditions must be met when a fault occurs for the drive to begin an
auto reset/run cycle.
•
The fault must be defined as an auto resettable fault
•
[Auto Rstrt Tries] setting must be greater than zero.
•
The drive must have been running, not jogging, not autotuning, and not
stopping, when the fault occurred. (Note that a DC Brake state is part of a stop
sequence and therefore is considered stopping.)
70EC 700VC 700H
✔ ✔